• State TI Thinks Resolved
  • Locked Locked
  • Replies 7 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 753 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPA2054D4: TPA2054D4　Pop Noise Issue

Kenji Ohno1
Genius 5095 points

Part Number: TPA2054D4

Hi Specialist,

When changing the Volume setting, only one Pop Noise will be shown.

Even if you change any bit other than Reserve, you hear a sound.

   Use OUT L ± and Headphone output for output

   Use   011:  Stereo Differential mode

Pop Noise occurs except for LIN 1-RIN1.

It turned out that the offset was added to the problematic output when changing the register.

When there is a rectangular wave when there is no sound, changing the register will change the wavelength (the width of the rectangular wave) for a moment.

(There was no change in the wavelength even if register was changed for those with no problem) 

I believe there is a DC Offset inside the input stage or inside and it is amplified.

The population is 10 pcs, of which Pop Noise Issue is 1 pcs.

I think that it is not caused by circuit or layout. Is this cause in the IC?

Do you have any case examples of it? 

I would like to know the solution.

Best Regards,

Kenji

  • 0
    TI__Guru** 114525 points
    Hi Kenji,

    We'll take a look at the description you give and provide some more feedback early next week.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    TI__Guru** 114525 points
    Kenji,

    It is recommended to first configure all the required gains/volumes in the signal path and enable the output drivers at the very end.
    The rectangular wave you mention is the Class-D output, right? So you're having this wavelength and pop issue only on one of the channels and only on some parts? Does the same output channel shows this behavior across the different ICs?

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    Genius 5095 points
    Hi Ivan,

    Is it the way you taught to disable the output driver before changing the volume and enable the driver after changing?

    It has been confirmed that this operation is not performed for different ICs.
    So I would like to know what is happening to this problematic IC.

    Best Regards,
    Kenji
  • 0 in reply to Kenji Ohno1
    TI__Guru** 114525 points
    Kenji,

    If there is only one IC that shows this behavior then it would mean that something has happen to this specific IC.
    From your description it seems that the oscillator that provides the frequency for the Class-D output is being affected when changing the volume.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    TI__Guru** 114525 points
    Kenji,

    It has been some time since last communication. Do you have updates or any questions?

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    Genius 5095 points
    Hi Ivan,

    I am sorry that the contact was very late.
    I asked the analysis with the quality department route, but analysis was refused.
    Since it was one occurrence, my customer decided to see the progress this time.

    If the same phenomenon happens again, please cooperate.

    Best Regards,
    Kenji
  • 0 in reply to Kenji Ohno1
    TI__Guru** 114525 points
    Hi Kenji,

    Thanks for the feedback, we'll follow up if you contact us again on the same matter.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators